I'd also like to know when FF was graphic and disturbing.
Don't get me wrong. I wasn't saying FF has ever been "OMG hide the children's eyes! It's too controversial!" graphic/disturbing. But as other people mentioned there have been some things done with pixels that, if done with live-action where you see it actually happening in detail, is pretty damn sure to get an R rating by today's standards for "mature content".
FF4- Burning down a village of innocents, assaulting a child, violence against children (since you have child characters in your party and there's that whole "we can't show a child getting hurt because people will baw" thing in mainstream American society right now), child "death", Barbiccia (if I remember correctly she's "supposed" practically topless as part of the original design, but I might be getting my information crossed). I'm sure there are a few other things but it's been forever and a day and honestly it's not worth digging any deeper.
FF5- Can't remember a whole lot from this game as I played it less than FF4 (despite it being my favorite in the series). I do know that Ex-Death at least contributes two points to this. Predominately where he pretty much tortures Galuf into critical mode (which while pretty tame in pixels would probably look downright horrifying in reality) and also his transformation into the End-Boss could be considered some Grade-A nightmare fuel. Also the "child problems" crop up here minus the death element.
FF6- Really all I should have to say is "Kefka". I'm sure I could dig up other things but really this guy takes the cake. Multiple instances of mass murder and attempted mass murder. One particular where you get to watch every soldier on the screen die of poison. And I think there were at least 5 that they show. Imagine that as a movie or a TV program showing 5 people dying from poison. Hell "The Dark Knight" only had one and they did it off screen (probably to avoid a higher rating). Not to mention at one point he practically succeeds in his genocidal desires. Then there's the final boss form of him. Done properly if Ex-Death was Grade-A nightmare fuel then Kefka is granted Grade-S. Also the same "child stuff" as FF5. Also a minor instance of tentacle molestation. >.>
Again, not really saying that it's "more dark or disturbing" that SMT or most modern games/movies; but when you think about it and actually visualize some of the stuff that happened in the games outside of the realm of pixels it can be pretty darn graphic for a typical audience that has no preparation for the content within.